AC 1919 then AC 181 at Toronto Pearson
Ottawa → Toronto → Vancouver
Timetable, Toronto time
10:28AC 1919 from Ottawa at the gate
14:30AC 181 to Vancouver leaves the gate
4 h 02 apart on the timetable
The last days
AC 1919 and AC 181 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.